There money is still in your list and Email Marketing is still a powerful marketing instrument. I don’t see it going anywhere (except getting stronger) in the next decades.
People allover the world are still stuck to their email addresses. As a matter of fact, it’s the cheapest and efficient way to get directly to someone with an Internet access.
With smartphones and email apps, it becomes even quicker to get any information of any size to someone on the go. Gone are those days when folks needed to logon to their personal computers to access their message through some standalone or web-base email clients.